CN111785211A - Pixel driving circuit, driving method, display panel and display device - Google Patents

Pixel driving circuit, driving method, display panel and display device Download PDF

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Publication number
CN111785211A
CN111785211A CN202010744750.5A CN202010744750A CN111785211A CN 111785211 A CN111785211 A CN 111785211A CN 202010744750 A CN202010744750 A CN 202010744750A CN 111785211 A CN111785211 A CN 111785211A
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compensation
driving transistor
data writing
transistor
unit
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CN111785211B (en
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张文帅
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The embodiment of the invention discloses a pixel driving circuit, a driving method, a display panel and a display device. The pixel driving circuit includes: the device comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a storage capacitor, a driving transistor, a light-emitting element and a data writing compensation unit; the data writing unit is used for providing a data voltage signal of a data signal end to the first node through the driving transistor in a data writing stage; the data writing compensation unit comprises a data writing compensation subunit and a compensation control subunit; the compensation control subunit is used for controlling the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage for the first node in the data writing stage. The embodiment of the invention can ensure that the storage capacitor is completely charged in the data writing stage, improve the charging effect and ensure the display quality of the display panel.

Description

Pixel driving circuit, driving method, display panel and display device
Technical Field
Embodiments of the present invention relate to display driving technologies, and in particular, to a pixel driving circuit, a driving method, a display panel, and a display device.
Background
An Organic Light Emitting Diode (OLED) display has the advantages of self-luminescence, low driving voltage, high Light Emitting efficiency, short response time, and flexible display, and is the most promising display currently.
The OLED element of the OLED display is a current-driven type element, and a corresponding pixel driving circuit needs to be provided to supply a driving current to the OLED element so that the OLED element can emit light. The pixel driving circuit of an OLED display generally includes a driving transistor capable of generating a driving current to drive an OLED element to emit light, a switching transistor, and a storage capacitor. In order to increase the display effect of the conventional OLED display, the refreshing frequency of the display is increased, and the display is performed in a high-frequency driving mode.
However, in the high-frequency driving mode, the charging time of the storage capacitor in the pixel driving circuit is shortened, the charging time is limited, and particularly in the low gray scale, the larger the data voltage is, the smaller the driving current generated by the driving transistor is, which affects the light emitting brightness of the OLED device, and finally results in poor visual effect.
Disclosure of Invention
The invention provides a pixel driving circuit, a driving method, a display panel and a display device, which are used for increasing a data writing path in a data writing stage, compensating data writing of an original driving transistor, improving the charging efficiency of a storage capacitor and ensuring better display quality.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, including: the device comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a storage capacitor, a driving transistor, a light-emitting element and a data writing compensation unit;
the initialization unit is electrically connected between an initialization signal end and a first node; the initialization unit is used for providing an initialization signal of the initialization signal end to the first node in an initialization stage;
the data writing unit is electrically connected between a data signal end and the first pole of the driving transistor; the grid electrode of the driving transistor and the first polar plate of the storage capacitor are electrically connected to the first node; the second polar plate of the storage capacitor is electrically connected with a power signal end; the data writing compensation unit is electrically connected between the first pole and the second pole of the driving transistor; the threshold compensation unit is electrically connected between the second pole of the driving transistor and the first node;
the data writing unit is used for providing a data voltage signal of the data signal end to the first node through the driving transistor in a data writing stage;
the data writing compensation unit comprises a data writing compensation subunit and a compensation control subunit; the compensation control subunit is used for controlling the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage to the first node in a data writing stage;
the threshold compensation unit is used for compensating the threshold voltage of the driving transistor to the first node;
the light-emitting control unit is electrically connected between the power signal end and the light-emitting element; the light-emitting control unit is used for controlling the driving current generated by the driving transistor to flow into the light-emitting element in a light-emitting stage so as to drive the light-emitting element to emit light.
In a second aspect, an embodiment of the present invention further provides a driving method of a pixel driving circuit, where the driving method is applied to the pixel driving circuit according to the first aspect, and the driving method includes:
in an initialization stage, the initialization unit provides an initialization signal of the initialization signal terminal to a first node;
in a data writing phase, the data writing unit supplies a data voltage signal of a data signal end to the first node through the driving transistor; the compensation control subunit controls the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage for the first node; the threshold compensation unit compensates a threshold voltage of the driving transistor to the first node;
in the light emitting stage, the light emitting control unit controls the driving current generated by the driving transistor to flow into the light emitting element to drive the light emitting element to emit light.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel driving circuit described in the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a display device, including the display panel described in the third aspect.
According to the pixel driving circuit, the driving method, the display panel and the display device, the initialization unit is arranged, the initialization signal is provided for the first node in the initialization stage, and the gate electrode and the storage capacitor of the driving transistor are initialized; the data writing unit is arranged to provide a data voltage signal to the first node in the data writing stage, and the threshold compensation unit is adopted to compensate the threshold voltage of the driving transistor to the first node, so that the light-emitting control unit controls the driving current generated by the driving transistor in the light-emitting stage to be free from the influence of the fluctuation of the threshold voltage of the driving transistor, and the accurate driving and control of the light-emitting brightness of the light-emitting element are ensured. Meanwhile, in the data writing stage, the data writing compensation subunit and the compensation control subunit in the data writing compensation unit are utilized, wherein the compensation control subunit controls the data writing compensation subunit to generate the data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage for the first node. The embodiment of the invention can ensure that data is written into the first node through the data writing unit and the data writing compensation subunit simultaneously in the data writing process, namely the storage capacitor is charged simultaneously, thereby ensuring that the storage capacitor can be charged completely in the data writing stage, enabling the potential of the first node to reach the preset compensated data voltage value, avoiding the error of the potential of the first node caused by incomplete charging, improving the charging effect, ensuring the driving quality of the pixel driving circuit, enabling the driving transistor to provide accurate and stable driving current for the light-emitting element, enabling the light-emitting element to emit light at the preset brightness, and further improving the display quality.
Drawings
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 5 and fig. 6 are schematic structural diagrams of two pixel driving circuits according to an embodiment of the present invention;
FIG. 7 is a timing diagram of signals of a pixel driving circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention;
FIG. 11 is a timing diagram of signals for the pixel driving circuit shown in FIG. 10;
fig. 12 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention;
fig. 13 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background section, in the conventional pixel driving circuit, a threshold compensation function is generally provided, for example, in the pixel driving circuit of 7T1C (seven transistors and one capacitor), since in the data writing phase, the data voltage at the data signal end needs to be written into the first node through the driving transistor and the threshold compensation unit, that is, the data voltage after threshold compensation is written onto the plate of the storage capacitor. In other words, in the data writing phase, the data voltage at the data signal end needs to be charged into the storage capacitor, so that the data voltage subjected to threshold compensation is stored on the plate of the storage capacitor. In a subsequent light emitting stage, the threshold compensation data voltage on the first node can enable the driving transistor to generate a driving current, so that the light emitting element is driven to emit light. However, in the high frequency display mode, the refresh frequency increases, the driving light-emitting time of each light-emitting element is shortened, the charging time of the storage capacitor is shortened in the corresponding data writing stage, and the plate of the storage capacitor is not fully charged, so that the data voltage of the first node cannot meet the requirement, and the light-emitting effect of the light-emitting element is not ideal.
To solve the above problem, an embodiment of the present invention provides a pixel driving circuit, including: the device comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a storage capacitor, a driving transistor, a light-emitting element and a data writing compensation unit; the initialization unit is electrically connected between the initialization signal end and the first node; the initialization unit is used for providing an initialization signal of an initialization signal end to the first node in an initialization stage; the data writing unit is electrically connected between the data signal end and the first pole of the driving transistor; the grid of the driving transistor and the first polar plate of the storage capacitor are electrically connected with a first node; the second electrode plate of the storage capacitor is electrically connected with the power signal end; the data writing compensation unit is electrically connected between the first pole and the second pole of the driving transistor; the threshold compensation unit is electrically connected between the second pole of the driving transistor and the first node; the data writing unit is used for providing a data voltage signal of a data signal end to the first node through the driving transistor in a data writing stage; the data writing compensation unit comprises a data writing compensation subunit and a compensation control subunit; the compensation control subunit is used for controlling the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage for the first node in the data writing stage; the threshold compensation unit is used for compensating the threshold voltage of the driving transistor to the first node; the light-emitting control unit is electrically connected between the power signal end and the light-emitting element; the light-emitting control unit is used for controlling the driving current generated by the driving transistor to flow into the light-emitting element in the light-emitting stage so as to drive the light-emitting element to emit light.
By adopting the technical scheme, the initialization unit provides an initialization signal for the first node in the initialization stage so as to initialize the first node, namely, the gate and the storage capacitor of the driving transistor are initialized; providing a data voltage signal to the first node in a data write phase through the data write unit; the threshold compensation unit is adopted to compensate the threshold voltage of the driving transistor to the first node, so that the driving current generated by the driving transistor is independent of the threshold voltage of the driving transistor, the light-emitting control unit controls the driving current of the driving transistor, and when the driving current flows into the light-emitting element in the light-emitting stage, the influence of the threshold voltage fluctuation of the driving transistor on the light-emitting brightness of the light-emitting element can be avoided. Meanwhile, in the data writing stage, the data writing compensation subunit and the compensation control subunit in the data writing compensation unit are utilized, wherein the compensation control subunit controls the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage for the first node, so that the data writing to the first node can be simultaneously performed through the data writing unit and the data writing compensation subunit in the data writing process, namely, the storage capacitor is charged simultaneously, the storage capacitor can be fully charged in the data writing stage, the potential of the first node can reach a preset compensated data voltage value, the error of the potential of the first node caused by incomplete charging is avoided, the charging effect is improved, the driving quality of the pixel driving circuit is ensured, and the driving transistor can provide accurate and stable driving current for the light-emitting element, the light emitting element emits light with preset brightness, and display quality is improved.
It should be noted that, in the above-mentioned pixel driving circuit, the data writing compensation unit includes a data writing compensation subunit and a compensation control subunit, where the data writing compensation subunit is mainly responsible for writing data synchronously with the data writing unit, and a compensation writing process of the data writing compensation subunit is substantially consistent with a writing process principle and a writing process of the data writing unit. And the compensation control subunit is responsible for controlling the compensation writing process and the period of time for writing data into the compensation subunit. In the data writing stage, the compensation control subunit controls the data to be written into the compensation subunit for compensation writing; in the light-emitting stage, the compensation control subunit closes the compensation writing process, and ensures that the data writing compensation subunit does not influence the work of other units or components in the pixel driving circuit in the light-emitting stage. Specifically, the process of closing the compensation writing by the compensation control subunit may be a process of turning off a compensation writing path for writing data into the compensation subunit, or a process of turning off a component for writing data into the compensation subunit.
The above is the core idea of the present invention, and based on the embodiments of the present invention, a person skilled in the art can obtain all other embodiments without creative efforts, which belong to the protection scope of the present invention. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 1, the pixel driving circuit includes: an initialization unit 10, a data writing unit 20, a threshold compensation unit 30, a light emission control unit (51 and 52), a storage capacitor Cst, a driving transistor T, a light emitting element 60, and a data writing compensation unit 40; the pixel driving circuit may further include a first node N1, an initialization signal terminal Vref, a data signal terminal Vdata, a power signal terminal PVDD, and a low voltage signal terminal PVEE.
The initialization unit 10 is electrically connected between the initialization signal terminal Vref and the first node N1; the initialization unit 10 is configured to provide an initialization signal of the initialization signal terminal Vref to the first node N1 in an initialization phase; the data writing unit 20 is electrically connected between the data signal terminal Vdata and the first pole T1 of the driving transistor T; the gate electrode G of the driving transistor T and the first plate a of the storage capacitor Cst are electrically connected to the first node N1; the second plate b of the storage capacitor Cst is electrically connected to the power signal terminal PVDD; the data write compensation unit 40 is electrically connected between the first pole T1 and the second pole T2 of the driving transistor T; the threshold compensation unit 30 is electrically connected between the second pole T2 of the driving transistor T and the first node N1;
the data writing unit 20 is configured to provide a data voltage signal of the data signal terminal Vdata to the first node N1 through the driving transistor T during a data writing phase; the data write compensation unit 40 includes a data write compensation subunit 41 and a compensation control subunit 42; the compensation control subunit 42 is configured to control the data writing compensation subunit 41 to generate a data compensation voltage according to the data voltage of the data signal terminal Vdata provided by the data writing unit 20 and provide the data compensation voltage to the first node N1 in the data writing phase; the threshold compensation unit 30 is for compensating the threshold voltage of the driving transistor T to the first node N1; the light emission control units (51 and 52) are electrically connected between the power signal terminal PVDD and the light emitting element 60; the light emission control unit (51 and 52) is configured to control the driving current generated by the driving transistor T to flow into the light emitting element 60 to drive the light emitting element 60 to emit light during the light emission phase.
The specific driving timing and steps of the pixel driving circuit will be described with reference to fig. 1. Specifically, in the initialization stage, the initialization unit 10 is turned on, and the initialization unit 10 provides the initialization signal of the initialization signal terminal Vref to the first node N1 so as to initialize the signal stored in the storage capacitor Cst and the gate G of the driving transistor T; the step is actually a process of resetting the storage capacitor Cst and the gate G of the driving transistor T, and is used to eliminate data voltage signals existing in the storage capacitor Cst and the gate G of the driving transistor T when a previous frame displays a picture, so that each driving and light-emitting process of each light-emitting element 60 is reset and then driven to emit light, uniformity of light-emitting control of each light-emitting element 60 is ensured, and uniformity of light-emitting brightness is ensured.
In the data writing stage, the data writing unit 20, the data writing compensation unit 40 and the threshold compensation unit 30 are all turned on, and the data voltage signal of the data signal terminal Vdata is sequentially written into the first node N1, i.e. the first plate of the storage capacitor Cst and the gate of the driving transistor T, through the data writing unit 20, the driving transistor T and the data writing compensation unit 40, and the threshold compensation unit 30, so that the gate voltage of the driving transistor T gradually increases until the driving transistor T is turned off when the voltage difference between the gate voltage of the driving transistor T and the first electrode T1 of the driving transistor T is equal to the threshold voltage of the driving transistor T.
Here, the data write compensation subunit 41 in the data write compensation unit 40 starts the compensation operation under the control of the compensation control subunit 42, that is, the writing of the data voltage signal is performed in synchronization with the driving transistor T. In other words, the data voltage signal of the data signal terminal Vdata is respectively charged to the first plate a of the storage capacitor Cst through the driving transistor T and the data writing compensation subunit 41 under the control of the data writing unit 20 and the compensation control subunit 42, and compared with the way of charging the first plate a of the storage capacitor Cst from the path of the driving transistor T alone, the added data writing compensation subunit 41 in the embodiment of the present invention provides an additional charging path, so that the charging efficiency can be improved, and the first node N1 can be ensured to reach the preset and threshold-compensated potential value in a shorter time. At this time, the voltage V1 of the first node N1 is Vd ═ Vd- | Vth |, where Vd is the data voltage of the data signal terminal and Vth is the threshold voltage of the driving transistor. It should also be noted that the compensation control subunit 42 controls the data writing compensation subunit 41 to be turned on, i.e. to provide another charging path, only in the data writing phase, and controls the data writing compensation subunit 41 to be turned off or turned off in the light emitting phase, so as to avoid the influence and interference of the data writing compensation subunit 41 on other units or components in the pixel driving circuit.
In the light emitting stage, the light emission control unit (51 and 52) is turned on, and the driving current generated by the driving transistor T flows into the light emitting element 60, and the light emitting element 60 emits light in response to the driving current.
Wherein the light emission control unit may include a first light emission control unit 51 and a second light emission control unit 52, and the first light emission control unit 51 is electrically connected between the power signal terminal and the first pole T1 of the driving transistor T; the second light emission control unit 52 is electrically connected between the second diode T2 of the driving transistor T and the first end of the light emitting element 60; the second terminal of the light emitting element 60 can be electrically connected to the low level signal terminal PVEE, so that when the first light emitting control unit 51 and the second light emitting control unit 52 are turned on in the light emitting stage, a current loop can be formed to drive the light emitting element 60 to emit light.
It should be noted that, in the embodiments of the present invention, specific structures of the initialization unit, the data writing unit, the threshold compensation unit, and the light emitting control unit are not specifically limited, and on the premise that the compensation function of the threshold voltage of the driving transistor and the data writing compensation function in the data writing stage can be realized, each unit of the pixel driving circuit may be designed according to actual needs. For convenience of understanding, specific structures of the initialization unit, the data writing unit, the threshold compensation unit, and the light emission control unit are exemplified below with respect to the embodiments of the present invention. The initialization unit 10 may include a first transistor M1, wherein a gate of the first transistor M1 is electrically connected to the first scan signal terminal S1. In the initialization phase, the first scan signal controls the first transistor M1 to be turned on, and the initialization signal terminal Vref performs the potential initialization on the first node N1 through the first transistor M1; in the non-initialization phase, the first scan signal controls the first transistor M1 to turn off. The data writing unit 20 includes a second transistor M2, the threshold compensation unit 30 includes a third transistor M3, and the gates of the second transistor M2 and the third transistor M3 are electrically connected to the second scan signal terminal S2. In the data writing stage, the second scan signal controls the second transistor M2 and the third transistor M3 to be turned on, and at this time, the data signal terminal Vdata writes the data voltage signal after threshold compensation to the first node N1 through the second transistor M2, the driving transistor T and the threshold compensation unit 30; in the non-data writing phase, the second scan signal controls the second transistor M2 and the third transistor M3 to be turned off. In the light emission control unit, the first light emission control unit 51 may be configured to include a fourth transistor M4, the second light emission control unit 52 may be configured to include a fifth transistor M5, and gates of the fourth transistor M4 and the fifth transistor M5 are electrically connected to the light emission control signal terminal Emit. In the light emitting stage, the light emitting control signal controls the fourth transistor M4 and the fifth transistor M5 to be turned on, and at this time, the power signal terminal PVDD, the fourth transistor M4, the driving transistor T, the fifth transistor M5 and the light emitting element 60 form a conducting channel, and the driving transistor T generates a driving current to drive the light emitting element 60 to emit light; in the non-emission period, the emission control signal controls the fourth transistor M4 and the fifth transistor M5 to turn off. It should be noted that the transistors and the driving transistors of the above units may be N-type transistors or P-type transistors, and the embodiments of the present invention are not limited thereto.
Based on the pixel driving circuit provided by the above embodiment, the embodiment of the invention also provides a driving method of the pixel driving circuit. Fig. 2 is a flowchart of a driving method of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 1 and fig. 2, the driving method of the pixel driving circuit includes:
s110, in an initialization stage, an initialization unit provides an initialization signal of an initialization signal end to a first node;
s120, in a data writing stage, the data writing unit supplies a data voltage signal of a data signal end to a first node through the driving transistor; the compensation control subunit controls the data writing compensation subunit to generate data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage to the first node; the threshold compensation unit compensates the threshold voltage of the driving transistor to the first node;
and S130, in the light emitting stage, the light emitting control unit controls the driving current generated by the driving transistor to flow into the light emitting element so as to drive the light emitting element to emit light.
On the basis of the above embodiments, the embodiments of the present invention further provide a specific pixel driving circuit structure. Fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 3, in the pixel driving circuit, the data writing compensation subunit 41 includes at least one compensation driving transistor 411, and a gate G of the compensation driving transistor 411 is electrically connected to the first node N1;
the first pole 4111 of the compensation driving transistor 411 is electrically connected to the first pole T1 of the driving transistor T, and the second pole 4112 of the compensation driving transistor 411 is electrically connected to the second pole T2 of the driving transistor T through the compensation control subunit 42; the compensation control subunit 42 is configured to control the second pole 4112 of the compensation driving transistor 411 and the second pole T2 of the driving transistor T to be turned on during the data writing phase; during the light emitting period, the second pole 4112 of the compensating driving transistor 411 is controlled to be disconnected from the second pole T2 of the driving transistor T.
The compensating driving transistor 411 and the driving transistor T are of the same type, and both of them can write the data voltage signal of the data signal terminal Vdata onto the first node N1 when the data writing unit is turned on, i.e. in the data writing phase. Of course, to implement the data writing process of the compensation driving transistor 411, the path where the compensation driving transistor 411 is located needs to be turned on, and in this data writing stage, the compensation control subunit 42 is responsible for turning on the path, that is, in this data writing compensation path or charging path, the compensation control subunit 42 essentially functions as a path switch. It should be noted that the compensation control subunit 42 is not only required to control the data writing compensation path to be turned on during the data writing phase, but also used to control the path to be turned off during the light emitting phase, so as to prevent the data writing compensation subunit 41 from influencing the driving transistor T to generate the driving current during the light emitting phase, and prevent the interference with the normal light emission of the light emitting element 60. In addition, the number of the compensation driving transistors 411 is not limited to two as shown in fig. 3 above, and it can be understood that the greater the number of the compensation driving transistors 411, the higher the charging efficiency of the storage capacitor Cst at the same time, i.e., the higher the efficiency of writing data to the first node N1, as a channel for data writing. Of course, considering that the layout design of the array substrate of the display panel actually needs to take into account factors such as area ratio, only one compensation driving transistor 411 may be provided in the data write compensation subunit 41.
In the pixel driving circuit shown in fig. 3, the compensation driving transistor serves as a data writing compensation channel for writing the data voltage signal of the data signal terminal Vdata into the first node N1 in synchronization with the driving transistor T, and the compensation control subunit 42 serves as a control unit for controlling the on/off of the data writing channel where the compensation driving transistor is located. In addition to the arrangement position shown in fig. 3 described above, the compensation control subunit 42 may also be arranged at one end of the compensation driving transistor 411 at which the data voltage signal is written. Fig. 4 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 4, specifically, a first pole 4111 of the compensation driving transistor 411 may be further disposed to be electrically connected to a first pole T1 of the driving transistor T through the compensation control subunit 42, and a second pole 4112 of the compensation driving transistor 411 is electrically connected to a second pole T2 of the driving transistor T; the compensation control subunit 42 is configured to control the first electrode 4111 of the compensation driving transistor 411 to be conductive with the first electrode T1 of the driving transistor T during a data writing phase, and control the first electrode 4111 of the compensation driving transistor 411 to be disconnected from the first electrode T1 of the driving transistor T during a light emitting phase.
In particular, with reference to fig. 3 and 4, the settable compensation control subunit 42 comprises at least one first compensation switching transistor 421; the number of the first compensation switching transistors 421 is equal to the number of the compensation driving transistors 411; the second pole 4112 of each compensation driving transistor 411 is electrically connected to the second pole T2 of the driving transistor T through a first compensation switching transistor 421 in a one-to-one correspondence; alternatively, the first pole 4111 of each compensation driving transistor 411 is electrically connected to the first pole T1 of the driving transistor T through one first compensation switching transistor 421 in a one-to-one correspondence.
Each of the first compensation switch transistors 421 is electrically connected to one of the compensation driving transistors 411 in a one-to-one correspondence, and each of the first compensation switch transistors 421 is used as a pass switch to control the compensation driving transistor 411 to be connected in parallel with the driving transistor T, i.e., the corresponding data writing compensation pass can be controlled to be turned on in a data writing stage, and the corresponding data writing compensation pass is controlled to be turned off in a light emitting stage.
Of course, in consideration of the limited area on the carrier of the pixel driving circuit, i.e. the array substrate, the embodiment of the invention also provides a setting mode of the compensation control subunit. Fig. 5 and fig. 6 are schematic structural diagrams of two pixel driving circuits provided by the embodiment of the present invention, and referring to fig. 5 and fig. 6, optionally, the compensation control subunit 42 includes a first compensation switch transistor 421; the second pole 4112 of each compensation driving transistor 411 is electrically connected to the second pole T2 of the driving transistor T through the first compensation switching transistor 421; alternatively, the first pole 4111 of each compensation driving transistor 411 is electrically connected to the first pole T1 of the driving transistor T through the first compensation switching transistor 421.
As described above, by providing a plurality of compensation driving transistors 411, each of which is connected in parallel with the driving transistor T through one first compensation switching transistor 421, the number of components of the pixel driving circuit can be reduced while ensuring that the number of data write compensation paths is increased, thereby avoiding the occupation area of the pixel driving circuit from being too large, and contributing to improving the aperture ratio of the pixel. In addition, in the pixel driving circuit shown in fig. 3-6, the compensation control subunit 42 is used as a pass switch to turn on the pass where the compensation driving transistor 411 is located in the data writing stage, so that the compensation driving transistor 411 is connected in parallel with the driving transistor T; in the light emitting stage, the path of the compensation driving transistor 411 is turned off, so that the compensation driving transistor 411 is disconnected from the driving transistor T.
As in the above embodiment, the compensation control subunit 42 is configured by the first compensation switch transistor 421, and the control of writing data into the compensation subunit 41 can be realized by controlling the first compensation switch transistor 421 to be turned on or off. Specifically, a control signal line may be connected to the gate of the first compensation switching transistor 421, and the control signal line may be used to provide an on signal in the data writing phase and an off signal in the light emitting phase. Specifically, in the pixel driving circuit described above, the control terminal of the data writing unit 20, the control terminal of the threshold compensation unit 30, and the gate of the first compensation switching transistor 421 may be electrically connected to the second scanning signal terminal S2; the second scan signal of the second scan signal terminal S2 is used to control the data writing unit 20, the threshold compensation unit 30 and the first compensation switch transistor 421 to be turned on during the data writing phase. At this time, the data writing unit 20, the threshold compensation unit 30, and the first compensation switch transistor 421 share a second scanning signal line, and the data writing unit 20, the threshold compensation unit 30, and the first compensation switch transistor 421 are respectively switched and controlled by using the scanning signal provided at the second scanning signal terminal S2, so that a control signal line provided for the first compensation switch transistor 421 can be saved, the complexity of the pixel driving circuit and the pixel driving chip can be reduced, the area utilization rate of the array substrate can be effectively improved, and the occupied area of the pixel driving circuit can be reduced.
With respect to the pixel circuits shown in fig. 3-6, the embodiment of the present invention further provides a specific signal timing control diagram, and fig. 7 is a signal timing diagram of the pixel driving circuit provided in the embodiment of the present invention, referring to fig. 3-7, wherein the gate of the first compensation switch transistor 421 receives the additionally provided control signal S3 or the second scan signal S2, and the second compensation transistor 421 exemplarily employs a P-type transistor (low level conduction). In the data writing stage, the first compensation switching transistor 421 is turned on according to the control signal of the low level, so that the data writing compensation is performed, and the storage capacitor Cst is charged in synchronization with the driving transistor T. Note that, in order to avoid the gate G of the compensation driving transistor 411 remaining the potential at the time of driving the previous frame, the gate G of the compensation driving transistor 411 may be initialized synchronously in the initialization stage, and referring to fig. 7, in the initialization stage, the control signal S3 received by the gate of the first compensation switching transistor 421 is kept as a low-level signal.
In the pixel driving circuit as shown in fig. 5 and 6, in order to improve the charging efficiency of the storage capacitor Cst during the data writing phase, a plurality of compensation driving transistors 411 (illustrated as two first compensation driving transistors 411) may be optionally included, and the data compensation voltage is written to the first node N1 by the plurality of compensation driving transistors 411 in synchronization with the data writing phase, that is, the storage capacitor Cst is charged in synchronization with the driving transistor T, so that the charging time of the storage capacitor Cst is shortened, and the charging efficiency is improved. However, considering the area occupation size of the pixel driving circuit and the design difficulty of the layout, only one compensation driving transistor 411 may be provided in the data writing compensation subunit 41. Fig. 8 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, referring to fig. 8, in the pixel driving circuit, the data writing compensation subunit 41 includes only one compensation driving transistor 411, the first compensation switching transistor 421 in the compensation control subunit 42 is connected in series with the compensation driving transistor 411, and at this time, the first compensation switching transistor 421 is responsible for conducting a charging path where the compensation driving transistor 411 is located. Specifically, the first compensation switch transistor 421 can be controlled to be turned on during the data writing phase by providing a control signal to the gate of the first compensation switch transistor 421, and the compensation driving transistor 411 performs writing of the data compensation voltage to the first node N1, i.e., synchronously charges the storage capacitor Cst. In addition, since the control signal of the threshold compensation unit 30, i.e., the second scan signal, controls the threshold compensation unit 30 to be turned on in the data writing stage, according to the conventional signal line, the gate of the first compensation switch transistor 421 may also be electrically connected to the second scan signal terminal S2, and the first compensation switch transistor 421 is synchronously controlled by the second scan signal, thereby reducing the number of signal lines and improving the feasibility of the pixel circuit layout design.
The embodiment of the invention also provides another pixel driving circuit aiming at the connection relation between the data writing compensation subunit and the compensation control subunit. Fig. 9 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present invention, referring to fig. 9, in which the data writing compensation subunit 41 includes at least one compensation driving transistor 411, a first pole 4111 of the compensation driving transistor 411 is electrically connected to a first pole T1 of the driving transistor T, and a second pole 4112 of the compensation driving transistor 411 is electrically connected to a second pole T2 of the driving transistor T;
the compensation control subunit 42 includes a first compensation control subunit 4201 and a second compensation control subunit 4202, the first compensation control subunit 4201 being electrically connected between the gate G of the compensation driving transistor 411 and the first node N1, the second compensation control subunit 4202 being electrically connected to the gate G of the compensation driving transistor 411; the first compensation control subunit 4201 is used for controlling the gate G of the compensation driving transistor 411 to be conductive to the first node N1 during the data writing phase; the second compensation control subunit 4202 is used for controlling the compensation transistor 411 to be turned off during the light emitting period.
Specifically, the first compensation control subunit 4201 includes a second compensation switch transistor 422, the second compensation switch transistor 422 is electrically connected between the gate G of the compensation driving transistor 411 and the first node N1; the second compensation switch transistor 422 is used for controlling the gate G of the compensation driving transistor 411 to be conducted with the first node N1 in the data writing stage according to the control signal received by the gate thereof;
the second compensation control subunit 4202 includes a third compensation switching transistor 423, the third compensation switching transistor 423 being electrically connected to the gate G of the compensation driving transistor 411; the third compensation switching transistor 423 is used for controlling the compensation driving transistor 411 to be turned off in a light emitting stage according to a control signal received by a gate thereof.
The compensation control subunit 42 formed by the first compensation control subunit 4201 and the second compensation control subunit 4202 is substantially a control unit that controls whether the compensation driving transistor 411 can normally operate. In the data writing phase, the first compensation control subunit 4201 is responsible for connecting the channel to ensure that the compensation driving transistor 411 and the driving transistor T have the same connection relationship, and the second compensation control subunit 4202 is responsible for providing a conducting signal to the gate G of the compensation driving transistor 411 to control the conduction of the compensation driving transistor 411, so as to perform the data writing operation as the driving transistor T, and make the compensation driving transistor 411 switch to the working state; during the light emitting period, the first compensation control subunit 4201 is responsible for turning off the path, while the second compensation control subunit 4202 is responsible for providing a turn-off signal to the gate G of the compensation driving transistor 411 to control the compensation driving transistor 411 to turn off, i.e. to switch the compensation driving transistor to an off state.
The specific signal driving process of the pixel driving circuit will be described below by taking the second compensation switch transistor 422 and the third compensation switch transistor 423 as P-type transistors (low-level conduction) as an example. In the data writing stage, the gate of the second compensation switch transistor 422 should be fed with a low level signal, the gate of the third compensation switch transistor 423 should be fed with a high level signal, at this time, the second compensation switch transistor 422 is turned on, the third compensation switch transistor 423 is turned off, and since the data writing unit 20 is turned on, the compensation driving transistor 411 and the driving transistor T perform data writing synchronously to charge the storage capacitor Cst; in the light emitting control phase, the gate G of the second compensation switch transistor 422 should be fed with a high level signal, and the gate G and the source S of the third compensation switch transistor 423 should be simultaneously fed with a low level signal, so as to control the second compensation switch transistor 422 to be turned on, and control the compensation driving transistor 411 to be turned off by using the low level signal fed from the source S, at this time, the compensation driving transistor 411 does not work.
Fig. 10 is a schematic structural diagram of a pixel driving circuit according to yet another embodiment of the present invention, referring to fig. 10, in which the data writing compensation subunit 41 includes at least one compensation driving transistor 411, a first pole 4111 of the compensation driving transistor 411 is electrically connected to a first pole T1 of the driving transistor T, and a second pole 4112 of the compensation driving transistor 411 is electrically connected to a second pole T2 of the driving transistor T;
the compensation control subunit 42 includes a first compensation control subunit 4201 and a second compensation control subunit 4202, the first compensation control subunit 4201 being electrically connected between the gate G of the compensation driving transistor 411 and the first node N1, the second compensation control subunit 4202 being electrically connected to the gate G of the compensation driving transistor 411; the first compensation control subunit 4201 is used for controlling the gate G of the compensation driving transistor 411 to be conductive to the first node N1 during the data writing phase; the second compensation control subunit 4202 is used for controlling the compensation transistor 411 to be turned off during the light emitting period.
Specifically, the first compensation control subunit 4201 includes a plurality of second compensation switching transistors 422, the plurality of second compensation switching transistors 422 being connected in parallel to each other between the gate G of the compensation driving transistor 411 and the first node N1; the second compensation switch transistor 422 is used for controlling the gate G of the compensation driving transistor 411 to be conducted with the first node N1 in the data writing phase according to the control signal received by the gate thereof;
the second compensation control subunit 4202 includes a third compensation switching transistor 423, the third compensation switching transistor 423 being electrically connected to the gate G of the compensation driving transistor 411; the third compensation switching transistor 423 is used for controlling the compensation driving transistor 411 to be turned off in a light emitting stage according to a control signal received by a gate thereof. For example, in the pixel driving circuit shown in fig. 10, the first compensation control subunit 4201 may be configured to include two second compensation switching transistors 422, the two second compensation switching transistors 422 being connected in parallel between the gate of the compensation driving transistor 411 and the first node N1, and thus, the connection of the compensation driving transistor 411 and the first node N1 may be achieved by controlling the turn-on or turn-off of the two second compensation switching transistors 422.
Further, in addition to the pixel driving circuit shown in fig. 10, in order to reduce the number of wirings of the pixel driving circuit and improve the area utilization rate of the array substrate, the control terminal of the initialization unit 10 may be electrically connected to the first scanning signal terminal S1; the control terminal of the data writing unit 20 and the control terminal of the threshold compensation unit 30 are both electrically connected to the second scan signal terminal S2; meanwhile, the gates of the two second compensation switching transistors 422 are electrically connected to the first scan signal terminal S1 and the second scan signal terminal S2, respectively;
the first scan signal of the first scan signal terminal S1 is used for controlling the initialization unit 10 to be turned on in the initialization period, and is also used for controlling the gate G of the compensation driving transistor 411 and the first node N1 to be turned on in the initialization period; the second scan signal of the second scan signal terminal S2 is used to control the data writing unit 20 and the threshold compensating unit 30 to be turned on during the data writing phase, and is also used to control the gate G of the compensating driving transistor 411 and the first node N1 to be turned on during the data writing phase.
The driving process of the pixel driving circuit shown in fig. 10 will be briefly described below by taking the compensation driving transistor 411 as a P-type transistor (low-level on) as an example. Fig. 11 is a signal timing diagram of the pixel driving circuit shown in fig. 10, referring to fig. 10 and 11, during the data writing phase, the second scan signal terminal S2 provides a low level signal, which is a high level signal, when the data writing unit 20 is turned on, the data voltage signal provided by the data signal terminal Vdata is written into the first node N1 through the driving transistor T and the threshold compensation unit 30, and at the same time, the second compensation switch transistor 422 having a gate connected to the second scan signal terminal S2 is turned on by the low level signal, so that the gate G of the compensation driving transistor 411 is turned on with the first node N1, and at this time, the data voltage signal is synchronously written into the first node N1 through the compensation driving transistor T and the threshold compensation unit 30, thereby realizing the compensation of data writing. It should be noted that, in the second compensation control subunit 4202, the control signal S5 received by the control terminal of the third compensation switch transistor 423 is a high level signal at this time, the third compensation switch transistor 423 is turned off in the initialization phase, the gate of the compensation driving transistor 411 is initialized synchronously according to the potential of the first node N1 in the initialization phase, and the compensation driving transistor 411 is turned on according to the voltages of the first node N1 and the data signal terminal Vdata in the data writing phase to write the compensation data signal into the first node N1.
In addition to the pixel driving circuits shown in fig. 9 and 10, the control signal line of the third compensation switching transistor in the second compensation control subunit may be shared by a signal line unique to the pixel driving circuit in the same manner. Fig. 12 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present invention, and referring to fig. 11 and 12, specifically, the light emission control unit includes a first light emission control unit 51 and a second light emission control unit 52; the control end of the first light-emitting control unit 51, the control end of the second light-emitting control unit 52 and the gate of the third compensation switching transistor 423 are all electrically connected to the light-emitting control signal end Emit; the input terminal of the first light emission control unit 51 and the other electrode of the third compensation switching transistor 423 are both electrically connected to the power signal terminal PVDD;
the light emission control signal of the light emission control signal end Emit is used for controlling the conduction of the first light emission control unit 51 and the second light emission control unit 52 in a light emission phase and is also used for controlling the conduction of the third compensation switch transistor 423 in a data writing phase; the power supply signal of the power supply signal terminal PVDD is used to control the compensation driving transistor 411 to be turned off during the light emitting period.
In the pixel driving circuit, the data writing compensation subunit 41 is composed of one or more compensation driving transistors 411, and the connection relationship between the compensation driving transistors and other units or components in the pixel driving circuit substantially matches the connection relationship between the driving transistors T and other units or components. When data writing is performed in synchronization with the driving transistor in the data writing stage, in order to ensure that the compensation driving transistor 411 and the driving transistor T perform data writing with the same efficiency, the device parameters of the compensation driving transistor 411 and the driving transistor T may be set to be the same. Specifically, the width-to-length ratios of the compensation driving transistor 411 and the driving transistor T may be set to be the same. Moreover, since the operation principle of the compensation driving transistor 411 and the driving transistor T is the same in the data writing phase, in order to avoid the gate G of the compensation driving transistor 411 remaining the potential at the time of driving the previous frame, the gate G of the compensation driving transistor 411 may be optionally initialized synchronously in the initialization phase. With continued reference to the pixel driving circuit shown in fig. 10 and fig. 11, during the initialization phase, the first scanning signal terminal S1 provides a low level signal, and the rest of the signals are high level signals, at this time, the initialization unit 10 is turned on, the initialization signal terminal Vref provides an initialization signal to the first node N1, and at the same time, the second compensation switch transistor 422 with its gate connected to the first scanning signal terminal S1 is turned on by the low level signal, so that the gate G of the compensation driving transistor 411 is turned on with the first node N1, and at this time, the initialization signal initializes the gate potentials of the compensation driving transistor 411 and the driving transistor T synchronously.
Embodiments of the present invention further provide a display panel, where the display panel includes the pixel driving circuit provided in the embodiments of the present invention, so that the display panel has the beneficial effects of the pixel driving circuit provided in the embodiments of the present invention, and the same points can be understood with reference to the above description, and details are not described herein again.
For example, fig. 13 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 13, a display panel 100 includes a plurality of pixels 101 arranged in an array, each pixel 101 includes a light emitting element and a pixel driving circuit according to an embodiment of the present invention, and the pixel driving circuit can drive the light emitting element to emit light, so that the display panel 100 can display a corresponding picture.
The embodiment of the present invention further provides a display device, which includes the display panel provided by the embodiment of the present invention, and therefore, the display device also has the beneficial effects of the display panel provided by the embodiment of the present invention, and the same points can be understood with reference to the above description, and the details are not described herein again.
For example, fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 14, a display device 200 according to an embodiment of the present invention includes the display panel 100 according to an embodiment of the present invention. The display device 200 may be any electronic device having a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, or a television.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (14)

1. A pixel driving circuit, comprising: the device comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a storage capacitor, a driving transistor, a light-emitting element and a data writing compensation unit;
the initialization unit is electrically connected between an initialization signal end and a first node; the initialization unit is used for providing an initialization signal of the initialization signal end to the first node in an initialization stage;
the data writing unit is electrically connected between a data signal end and the first pole of the driving transistor; the grid electrode of the driving transistor and the first polar plate of the storage capacitor are electrically connected to the first node; the second polar plate of the storage capacitor is electrically connected with a power signal end; the data writing compensation unit is electrically connected between the first pole and the second pole of the driving transistor; the threshold compensation unit is electrically connected between the second pole of the driving transistor and the first node;
the data writing unit is used for providing a data voltage signal of the data signal end to the first node through the driving transistor in a data writing stage;
the data writing compensation unit comprises a data writing compensation subunit and a compensation control subunit; the compensation control subunit is used for controlling the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage to the first node in a data writing stage;
the threshold compensation unit is used for compensating the threshold voltage of the driving transistor to the first node;
the light-emitting control unit is electrically connected between the power signal end and the light-emitting element; the light-emitting control unit is used for controlling the driving current generated by the driving transistor to flow into the light-emitting element in a light-emitting stage so as to drive the light-emitting element to emit light.
2. The pixel driving circuit according to claim 1, wherein the data writing compensation subunit comprises at least one compensation driving transistor, a gate of the compensation driving transistor being electrically connected to the first node;
a first pole of the compensation driving transistor is electrically connected with a first pole of the driving transistor, and a second pole of the compensation driving transistor is electrically connected with a second pole of the driving transistor through the compensation control subunit; the compensation control subunit is configured to control the second pole of the compensation driving transistor and the second pole of the driving transistor to be turned on in the data writing phase, and control the second pole of the compensation driving transistor and the second pole of the driving transistor to be turned off in the light emitting phase;
or, a first pole of the compensation driving transistor is electrically connected with a first pole of the driving transistor through the compensation control subunit, and a second pole of the compensation driving transistor is electrically connected with a second pole of the driving transistor; the compensation control subunit is configured to control the first electrode of the compensation driving transistor and the first electrode of the driving transistor to be turned on in the data writing phase, and control the first electrode of the compensation driving transistor and the first electrode of the driving transistor to be turned off in the light emitting phase.
3. The pixel driving circuit according to claim 2, wherein the compensation control subunit comprises at least one first compensation switching transistor; the number of the first compensation switch transistors is equal to that of the compensation driving transistors;
the second pole of each compensation driving transistor is electrically connected with the second pole of the driving transistor through one first compensation switching transistor in a one-to-one correspondence mode; alternatively, the first pole of each of the compensation driving transistors is electrically connected to the first pole of the driving transistor through one of the first compensation switching transistors in a one-to-one correspondence.
4. The pixel driving circuit according to claim 2, wherein the compensation control subunit comprises a first compensation switching transistor;
a second pole of each of the compensation driving transistors is electrically connected with the second pole of the driving transistor through the first compensation switching transistor; alternatively, the first pole of each of the compensation driving transistors is electrically connected to the first pole of the driving transistor through the first compensation switching transistor.
5. The pixel driving circuit according to claim 3 or 4, wherein the control terminal of the data writing unit, the control terminal of the threshold compensation unit, and the gate of the first compensation switching transistor are electrically connected to a second scan signal terminal;
and the second scanning signal of the second scanning signal end is used for controlling the data writing unit, the threshold compensation unit and the first compensation switch crystal to be conducted in the data writing stage.
6. The pixel driving circuit according to claim 1, wherein the data writing compensation subunit comprises at least one compensation driving transistor, a first pole of the compensation driving transistor is electrically connected to a first pole of the driving transistor, and a second pole of the compensation driving transistor is electrically connected to a second pole of the driving transistor;
the compensation control subunit comprises a first compensation control subunit and a second compensation control subunit, the first compensation control subunit is electrically connected between the grid electrode of the compensation driving transistor and the first node, and the second compensation control subunit is electrically connected with the grid electrode of the compensation driving transistor;
the first compensation control subunit is used for controlling the grid electrode of the compensation driving transistor to be conducted with the first node in the data writing stage;
the second compensation control subunit is used for controlling the compensation transistor to be turned off in a light emitting stage.
7. The pixel driving circuit according to claim 6, wherein the first compensation control subunit comprises a second compensation switching transistor electrically connected between the gate of the compensation driving transistor and the first node;
the second compensation switch transistor is used for controlling the grid electrode of the compensation driving transistor to be conducted with the first node in the data writing stage according to a control signal received by the grid electrode of the second compensation switch transistor;
the second compensation control subunit comprises a third compensation switch transistor which is electrically connected with the grid electrode of the compensation driving transistor;
the third compensation switch transistor is used for controlling the compensation driving transistor to be turned off in the light-emitting stage according to the control signal received by the grid electrode of the third compensation switch transistor.
8. The pixel driving circuit according to claim 6, wherein the first compensation control subunit comprises a plurality of second compensation switching transistors connected in parallel with each other between the gate of the compensation driving transistor and the first node;
the second compensation switch transistor is used for controlling the grid electrode of the compensation driving transistor to be conducted with the first node in the data writing stage according to a control signal received by the grid electrode of the second compensation switch transistor;
the second compensation control subunit comprises a third compensation switch transistor which is electrically connected with the grid electrode of the compensation driving transistor;
the third compensation switch transistor is used for controlling the compensation driving transistor to be turned off in the light-emitting stage according to the control signal received by the grid electrode of the third compensation switch transistor.
9. The pixel driving circuit according to claim 8, wherein the first compensation control subunit comprises two second compensation switching transistors;
the control end of the initialization unit is electrically connected with the first scanning signal end; the control end of the data writing unit and the control end of the threshold compensation unit are both electrically connected with a second scanning signal end; the grids of the two second compensation switch transistors are respectively and electrically connected with the first scanning signal end and the second scanning signal end;
the first scanning signal of the first scanning signal end is used for controlling the initialization unit to be conducted in the initialization stage and controlling the grid electrode of the compensation driving transistor and the first node to be conducted in the initialization stage;
the second scanning signal of the second scanning signal terminal is used for controlling the data writing unit and the threshold compensation unit to be conducted in the data writing stage, and is also used for controlling the grid electrode of the compensation driving transistor and the first node to be conducted in the data writing stage.
10. The pixel driving circuit according to claim 7 or 8,
the light-emitting control unit comprises a first light-emitting control unit and a second light-emitting control unit; the control end of the first light-emitting control unit, the control end of the second light-emitting control unit and the grid electrode of the third compensation switch transistor are electrically connected with a light-emitting control signal end;
the input end of the first light-emitting control unit and the second pole of the third compensation switch transistor are both electrically connected with a power signal end;
the light-emitting control signal of the light-emitting control signal end is used for controlling the conduction of the first light-emitting control unit and the second light-emitting control unit in the light-emitting stage and is also used for controlling the conduction of the third compensation switch transistor in the data writing stage;
and the power supply signal of the power supply signal end is used for controlling the compensation driving transistor to be cut off in the light-emitting stage.
11. The pixel driving circuit according to claim 2 or 6, wherein the width-to-length ratios of the compensation driving transistor and the driving transistor are the same.
12. A driving method of a pixel driving circuit, applied to the pixel driving circuit according to any one of claims 1 to 11, the driving method comprising:
in an initialization stage, the initialization unit provides an initialization signal of the initialization signal terminal to a first node;
in a data writing phase, the data writing unit supplies a data voltage signal of a data signal end to the first node through the driving transistor; the compensation control subunit controls the data writing compensation subunit to generate a data compensation voltage according to the data voltage of the data signal end provided by the data writing unit and provide the data compensation voltage for the first node; the threshold compensation unit compensates a threshold voltage of the driving transistor to the first node;
in the light emitting stage, the light emitting control unit controls the driving current generated by the driving transistor to flow into the light emitting element to drive the light emitting element to emit light.
13. A display panel comprising the pixel drive circuit according to any one of claims 1 to 12.
14. A display device characterized by comprising the display panel according to claim 13.
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